// Saturday Night — Bay City Rollers
// 137 bpm, 4/4, key G major. Source: mcgill.
// Generated by strudelify. One cycle = one bar.
setcpm(137/4)

const chords = arrange(
  // intro (8 bars)
  [8, "<~!4 G!4>"],
  // verse (8 bars)
  [8, "<G Em C D G Em C D>"],
  // pre-chorus (5 bars)
  [5, "<Em Bm C D!2>"],
  // chorus (8 bars)
  [8, "<G C G D G C G D>"],
  // chorus (7 bars)
  [7, "<C G Am7 G C G Am7>"],
  // interlude (8 bars)
  [8, "<G!2 ~!2 G!4>"],
  // verse (8 bars)
  [8, "<G Em C D G Em C D>"],
  // pre-chorus (5 bars)
  [5, "<Em Bm C D!2>"],
  // chorus (8 bars)
  [8, "<G C G D G C G D>"],
  // chorus (7 bars)
  [7, "<C G Am7 G C G Am7>"],
  // interlude (13 bars)
  [13, "<G!2 ~!2 G!9>"],
  // chorus (8 bars)
  [8, "<C G Am7 G C G Am7 G>"],
  // fadeout (4 bars)
  [4, "<C G Am7 G>"],
)
const bassline = arrange(
  [8, "<~!4 g2!4>"],
  [8, "<g2 e2 c2 d2 g2 e2 c2 d2>"],
  [5, "<e2 b2 c2 d2!2>"],
  [8, "<g2 c2 g2 d2 g2 c2 g2 d2>"],
  [7, "<c2 b2 a2 g2 c2 b2 a2>"],
  [8, "<g2!2 ~!2 g2!4>"],
  [8, "<g2 e2 c2 d2 g2 e2 c2 d2>"],
  [5, "<e2 b2 c2 d2!2>"],
  [8, "<g2 c2 g2 d2 g2 c2 g2 d2>"],
  [7, "<c2 b2 a2 g2 c2 b2 a2>"],
  [13, "<g2!2 ~!2 g2!9>"],
  [8, "<c2 b2 a2 g2 c2 b2 a2 g2>"],
  [4, "<c2 b2 a2 g2>"],
)

// chords · gm_piano
const keys = chord(chords).voicing().s("gm_piano").gain(0.8)
// bass · gm_electric_bass_finger
const bass = note(bassline).s("gm_electric_bass_finger").gain(0.9)
// drums
const drums = s("[bd hh] [sd hh] [bd hh] [sd hh]").gain(0.8)

stack(keys, bass, drums)